Hi,
Try this:
./backup >> /var/log/backup.log 2>&1
The part that I added on basically says "send error messages (the '2')
to the same place you send standard output messages (the '1', which in
this case, you've redirected to /var/log/backup.log with the '>>')"
For a more detailed explanation, see here:
http://www.tldp.org/LDP/abs/html/io-redirection.html
Hope This Helps,
Erik.
Jean Lee wrote:
> Hello,
>> I am not sure this is the correct list to ask this question but I don't
> know where to ask it. If somebody knows, please redirect me.
>> I am writing a backup script using bash and I want to log the output in
> "/var/log/backup.log"
> The saved files have to be stored on an external hard drive on "/dev/sda1"
>> the script works and contains :
>> mount /dev/sda1
> ....
> cp /usr/Users/FolderToBackup /mnt/usb0/
> ....
> umount /dev/sda1
>> On the terminal command line, I type :
>> ./backup >> /var/log/backup.log
>> nothing is returned on the terminal and all the output is redirected to
> "/var/log/backup.log".
> It works always fine.
>> Now, if the external hard drive is not present on "/dev/sda1" and I type :
> ./backup >> /var/log/backup.log
>> On the terminal, I have :
> /dev/sda1 : Input/Output error
> mount : you must specify the filesystem type
> umount : /dev/sda1 not mounted
>> My questions are :
>> Why are these lines not logged in "/var/log/backup.log" ?
> Is there a way to redirect it ?
>> Or perhaps that I made a mistake in my script architecture (This is my
> first script) :
> I want to test an external hard drive availability on "/dev/sda1" by
> doing a grep in "/var/log/backup.log". Does anybody knows a better way
> to do it ? (better than logging the output of "mount" in
> "/var/log/backup.log" and then testing it with a grep)
>> Thank you for any answer,
>> Jean LEE
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--
e r i k w i l l i a m s o n erik at cpsc.ucalgary.ca
system admin . department of computer science . university of calgary